This is why it’s important to try and remove annual weeds before they set seed, otherwise you could end up with more weeds next year.
Perennial weeds are tougher to remove and can live a lot longer.
They can live for two years or longer and survive winter by storing food in their roots.
Perennial weeds’ roots can also be harder to dig out because they spread underground.
Examples of perennial weeds include spear thistle, red valerian, dandelion, bind weeds, brambles, nettles and docks.